diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-01-23 20:01:34 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-01-23 21:40:01 +0300 |
| commit | 6321bef028de43724c47cfa7f9dee69ecb783796 (patch) | |
| tree | 2662f6f43b7ee040d48c2e9a049b8ab821ebae9b /drivers/md | |
| parent | 475389ae5c08656f8bb5cc3adc88a531c7c4877f (diff) | |
| download | linux-6321bef028de43724c47cfa7f9dee69ecb783796.tar.xz | |
bcache: use read_cache_page_gfp to read the superblock
Avoid a pointless dependency on buffer heads in bcache by simply open
coding reading a single page. Also add a SB_OFFSET define for the
byte offset of the superblock instead of using magic numbers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/bcache/super.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 5797c03f993e..3dea1d5acd5c 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -15,7 +15,6 @@ #include "writeback.h" #include <linux/blkdev.h> -#include <linux/buffer_head.h> #include <linux/debugfs.h> #include <linux/genhd.h> #include <linux/idr.h> @@ -64,13 +63,14 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev, { const char *err; struct cache_sb_disk *s; - struct buffer_head *bh = __bread(bdev, 1, SB_SIZE); + struct page *page; unsigned int i; - if (!bh) + page = read_cache_page_gfp(bdev->bd_inode->i_mapping, + SB_OFFSET >> PAGE_SHIFT, GFP_KERNEL); + if (IS_ERR(page)) return "IO error"; - - s = (struct cache_sb_disk *)bh->b_data; + s = page_address(page) + offset_in_page(SB_OFFSET); sb->offset = le64_to_cpu(s->offset); sb->version = le64_to_cpu(s->version); @@ -188,12 +188,10 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev, } sb->last_mount = (u32)ktime_get_real_seconds(); - err = NULL; - - get_page(bh->b_page); *res = s; + return NULL; err: - put_bh(bh); + put_page(page); return err; } |